Macias conducted numerous interviews for Mexican American Mojo, and the voices of little-known artists and fans fill its pages. In addition, more famous musicians such as Ritchie Valens and Lalo Guerrero are considered anew in relation to their contemporaries and the city. Macias examines language, fashion, and subcultures to trace the history of hip and cool in Los Angeles as well as the Chicano influence on urban culture. He argues that a grass-roots "multicultural urban civility" that challenged the attempted containment of Mexican Americans and African Americans emerged in the neighborhoods, schools, nightclubs, dance halls, and auditoriums of mid-twentieth-century Los Angeles. So take a little trip with Macias, via streetcar or freeway, to a time when Los Angeles had advanced public high school music programs, segregated musicians' union locals, a highbrow municipal Bureau of Music, independent R & B labels, and robust rock and roll and Latin music scenes.